<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="app">
        <input type="button" value="v-on指令" v-on:click="doIt">
        <input type="button" value="v-on简写" @click="doIt">
        <input type="button" value="双击事件" @dblclick="doIt">
        <h2 @click="changeFood">{{food}}</h2>
    </div>

     <!-- 开发环境版本，包含了有帮助的命令行警告 -->
     <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"> </script>
     <script>
         var app = new Vue({
         el: '#app',
         data:{
        food:"西红柿炒蛋"
         },
        methods: {
            doIt:function(){
                alert("做It")
            },
            changeFood:function(){
                // console.log(this.food);
                this.food+="好好吃啊"
            }
        },
 })
     </script>
</body>
</html>